May in Hartford averages a daily high of 21.8°C with nights around 9.7°C. Expect roughly 12.8 wet days totalling 87.5mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Hartford is May–June.
Based on HARTFORD BRAINARD AIRPORT, CT US (4.2km), 1995–2024. 29 years of May data.